diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index 72a62cc02..a8dd4f5f7 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.137 - 
 ====================================
+  Document raid status values.
 
 Version 1.02.136 - 5th November 2016
 ====================================
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 97c3e51f2..09e3fcc4b 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -327,7 +327,9 @@ struct dm_status_raid {
 	uint64_t mismatch_count;
 	uint32_t dev_count;
 	char *raid_type;
+	/* A - alive,  a - alive not in-sync,  D - dead/failed */
 	char *dev_health;
+	/* idle, frozen, resync, recover, check, repair */
 	char *sync_action;
 };